1971 AMC 12 第 3 题
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所有题目均经美国数学协会（MAA）官方合法授权使用。
3.
在 平面内，点 位于连接 与 的直线上，则 等于：
If the point lies on the straight line joining the points and in the -plane, then is equal to:
其他年份的第 3 题
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